Re: Permission denied

[James Pearson <james-p@moving-picture.com>]

What version of nfs-utils are you running on the server?

I had a problem if the server crashed before a client mount could be
recorded to /var/lib/nfs/rmtab, the client got permission denied on the
mount point after the server rebooted - see:

http://marc.theaimsgroup.com/?l=linux-nfs&m=101828003630443&w=2

This is fixed in the more recent versions of nfs-utils.

Also, if you manually attempt to umount an NFS file system (automounted
or not), but the umount fails because the file system is busy - this
will cause a problem as rpc.mountd on the server has already removed the
client from /var/lib/nfs/rmtab - which means if the server reboots, the
server has no record of the client mount, so you get permission denied
on client when it accesses the mount point ... see:

http://marc.theaimsgroup.com/?l=linux-nfs&m=104558814532107&w=2

I had this problem - my work round is not to manually umount automounted
file systems ... (or, if I have to, use a hacked version of umount that
doesn't contact rpc.mountd on the server).

James Pearson

Jeremy Sanders wrote:
> 
> I've seen this problem a couple of times (I think I reported it to the
> list before but I can find the posting). Using the automounter to mount
> home directories (rw,v3,rsize=8192,wsize=8192,hard,intr,udp,lock), it
> seems that rebooting a Linux server can give a "Permission denied" on
> the client. Further attempts at accessing the mountpoint give this error.
> It can be fixed my umounting it (if nothing is using it), and reaccessing
> the mountpoint.
> 
> The server is running RedHat's 2.4.18-27.7.x kernel, and the client is
> using 2.4.18-17.7.x (unfortunately).
> 
> dmesg on the client shows:
> 
> nfs: server server.ast.cam.ac.uk not responding, still trying
> nfs: task 57889 can't get a request slot
> nfs: server server.ast.cam.ac.uk OK
> nfs: server server.ast.cam.ac.uk OK
> 
> sendmail gave errors such as:
> 
> May  7 16:07:39 xserv1 sendmail[22255]: h47EwYl22254: forward
> /home/gmorris: transient error: Timeout on file open
> May  7 16:07:39 xserv1 sendmail[22195]: h47Eljl22194: forward
> /home/gmorris: transient error: Timeout on file open
> May  7 16:07:39 xserv1 sendmail[22255]: h47EwYl22254: forward
> /home/gmorris/.forward: Permission denied
> May  7 16:07:39 xserv1 sendmail[22195]: h47Eljl22194: forward
> /home/gmorris/.forward: Permission denied
> 
> Any ideas? I suppose it's hard to diagnose this without a network traffic
> analysis, and we're not using the standard kernel either. I suppose it
> could be an automounter bug.
> 
> Jeremy
> 
> --
> Jeremy Sanders <jss@ast.cam.ac.uk>   http://www-xray.ast.cam.ac.uk/~jss/
> X-Ray Group, Institute of Astronomy, University of Cambridge, UK.
> Public Key Server PGP Key ID: E1AAE053
> 
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